Hackers calling themselves “Guardians of Peace” threatened attacks at theaters during the opening of the comedy film, which stars Seth Rogen and James Franco in a plot to assassinate North Korea's leader Kim Jong-un.

Along with threatening the film’s opening, the hackers have leaked budgets to Sony films, salary information of top executives, employee social security numbers, controversial emails of executives, and aliases of Hollywood stars.

Intelligence officials have concluded that the cyberattack on Sony was “both state sponsored and far more destructive than any seen before on American soil,” the Times said. But officials were uncertain whether Sony insiders may have aided the hackers.

U.S. officials have determined with "99 percent certainty" that the North Korean government is behind the cyberattack on Sony Pictures that led the company to cancel the release of comedy film "The Interview," The Washington Post reported.